Add AIDL interface and puller implementation for automotive devices.

Changes:
  - Adds hidden ICarStatsService AIDL API.
  - Adds CarStatsPuller for pulling atoms from ICarStatsService.
  - Pulls VmsClientStats via CarStatsPuller.

Bug: 141697665
Test: Manual testing on hawk using statsd_testdrive
Change-Id: I44e104d430f64b1bd3dce96e9749df79ab3d2fbf
Merged-In: I44e104d430f64b1bd3dce96e9749df79ab3d2fbf
(cherry picked from commit 9dc13578f7)

cmds/statsd/Android.bp

@@ -50,6 +50,7 @@ cc_defaults {
 
     srcs: [
         ":statsd_aidl",
+        ":ICarStatsService.aidl",
         "src/active_config_list.proto",
         "src/statsd_config.proto",
         "src/uid_data.proto",
@@ -69,6 +70,7 @@ cc_defaults {
         "src/config/ConfigKey.cpp",
         "src/config/ConfigListener.cpp",
         "src/config/ConfigManager.cpp",
+        "src/external/CarStatsPuller.cpp",
         "src/external/GpuStatsPuller.cpp",
         "src/external/Perfetto.cpp",
         "src/external/StatsPuller.cpp",

cmds/statsd/src/external/CarStatsPuller.cpp

@@ -0,0 +1,96 @@
+/*
+ * Copyright 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define DEBUG false
+#include "Log.h"
+
+#include <binder/IServiceManager.h>
+#include <com/android/internal/car/ICarStatsService.h>
+
+#include "CarStatsPuller.h"
+#include "logd/LogEvent.h"
+#include "stats_log_util.h"
+
+using android::binder::Status;
+using com::android::internal::car::ICarStatsService;
+
+namespace android {
+namespace os {
+namespace statsd {
+
+static std::mutex gCarStatsMutex;
+static sp<ICarStatsService> gCarStats = nullptr;
+
+class CarStatsDeathRecipient : public android::IBinder::DeathRecipient {
+ public:
+     CarStatsDeathRecipient() = default;
+     ~CarStatsDeathRecipient() override = default;
+
+  // android::IBinder::DeathRecipient override:
+  void binderDied(const android::wp<android::IBinder>& /* who */) override {
+      ALOGE("Car service has died");
+      std::lock_guard<std::mutex> lock(gCarStatsMutex);
+      if (gCarStats) {
+          sp<IBinder> binder = IInterface::asBinder(gCarStats);
+          binder->unlinkToDeath(this);
+          gCarStats = nullptr;
+      }
+  }
+};
+
+static sp<CarStatsDeathRecipient> gDeathRecipient = new CarStatsDeathRecipient();
+
+static sp<ICarStatsService> getCarService() {
+    std::lock_guard<std::mutex> lock(gCarStatsMutex);
+    if (!gCarStats) {
+        const sp<IBinder> binder = defaultServiceManager()->checkService(String16("car_stats"));
+        if (!binder) {
+            ALOGW("Car service is unavailable");
+            return nullptr;
+        }
+        gCarStats = interface_cast<ICarStatsService>(binder);
+        binder->linkToDeath(gDeathRecipient);
+    }
+    return gCarStats;
+}
+
+CarStatsPuller::CarStatsPuller(const int tagId) : StatsPuller(tagId) {
+}
+
+bool CarStatsPuller::PullInternal(std::vector<std::shared_ptr<LogEvent>>* data) {
+    const sp<ICarStatsService> carService = getCarService();
+    if (!carService) {
+        return false;
+    }
+
+    vector<StatsLogEventWrapper> returned_value;
+    Status status = carService->pullData(mTagId, &returned_value);
+    if (!status.isOk()) {
+        ALOGW("CarStatsPuller::pull failed for %d", mTagId);
+        return false;
+    }
+
+    data->clear();
+    for (const StatsLogEventWrapper& it : returned_value) {
+        LogEvent::createLogEvents(it, *data);
+    }
+    VLOG("CarStatsPuller::pull succeeded for %d", mTagId);
+    return true;
+}
+
+}  // namespace statsd
+}  // namespace os
+}  // namespace android

cmds/statsd/src/external/CarStatsPuller.h

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "StatsPuller.h"
+
+namespace android {
+namespace os {
+namespace statsd {
+
+/**
+ * Pull atoms from CarService.
+ */
+class CarStatsPuller : public StatsPuller {
+public:
+    explicit CarStatsPuller(const int tagId);
+    bool PullInternal(std::vector<std::shared_ptr<LogEvent>>* data) override;
+};
+
+}  // namespace statsd
+}  // namespace os
+}  // namespace android

cmds/statsd/src/external/StatsPullerManager.cpp

@@ -27,6 +27,7 @@
 #include "../logd/LogEvent.h"
 #include "../stats_log_util.h"
 #include "../statscompanion_util.h"
+#include "CarStatsPuller.h"
 #include "GpuStatsPuller.h"
 #include "PowerStatsPuller.h"
 #include "ResourceHealthManagerPuller.h"
@@ -267,6 +268,10 @@ std::map<int, PullAtomInfo> StatsPullerManager::kAllPullAtomInfo = {
         // App ops
         {android::util::APP_OPS,
          {.puller = new StatsCompanionServicePuller(android::util::APP_OPS)}},
+        // VmsClientStats
+        {android::util::VMS_CLIENT_STATS,
+         {.additiveFields = {5, 6, 7, 8, 9, 10},
+          .puller = new CarStatsPuller(android::util::VMS_CLIENT_STATS)}},
 };
 
 StatsPullerManager::StatsPullerManager() : mNextPullTimeNs(NO_ALARM_UPDATE) {

core/java/Android.bp

@@ -7,3 +7,8 @@ filegroup {
     name: "IDropBoxManagerService.aidl",
     srcs: ["com/android/internal/os/IDropBoxManagerService.aidl"],
 }
+
+filegroup {
+    name: "ICarStatsService.aidl",
+    srcs: ["com/android/internal/car/ICarStatsService.aidl"],
+}

core/java/com/android/internal/car/ICarStatsService.aidl

@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.internal.car;
+
+import android.os.StatsLogEventWrapper;
+
+/**
+ * Interface for pulling statsd atoms from automotive devices.
+ *
+ * @hide
+ */
+interface ICarStatsService {
+    /**
+     * Pull the specified atom. Results will be sent to statsd when complete.
+     */
+    StatsLogEventWrapper[] pullData(int atomId);
+}